Telephone-switchboard



mo Model.) 3 Shets-Sheet 1.

H. V. HAYES. TELEPHONE SWITUHBOARD.

No. 586,685. Patented July 20, 1897.

JHIINIGIHIIIIMQ' 3, Sheets-Sheet (No Model.)

H V HAYES TELEPHONE SWITGHBOARD.

Patented July 20,1897.

(No Model.)

TELEPHONE SWITGHBO'ARD.

No. 586,685. Patented July 20, 1897,

E. 9: v familial," 5 mm 0 4 ,14 fi\/* g 3 Sheets-Sheen 3. H. V. HAYES.

UNITED STATES PATENT OFF CE.

nAMMoND v. HAYES, F. CAMBRIDGE, tinssncnusnrrs, ASSlGNOR ro THE AMERICANBELL TELEPHONE COMPANY, OF BOSTON, MASSACHUSETTS.

TELEPHON E-ISWITCH BOARD.

SPECIFICATION forming part of Letters Patent o. 586,685, dated J uly 20,1897.

Application filed January, 1897. Serial No; 621,168. (No model.)

1''!) all whom it may cmwcrrw Be it known that I, HAMMOND..VINTON HAYES,of Cambridge; inthe. State of Massachusetts, have invented. 'a' ln'ew duseful Improvement in 'Ielephone-Switch cards, of which the following isa specification. H

The invention is appliedtoa'telephoneexr change system knowntechnicallyas'a meascred-service system; and-its objectiis to pro--vicie suitable means whereby all calls fofconnections sent in from atelephone-substation and answered by, tl1e operator at the tele-' phonecentral oflic'etnaybe automatically recorded and whereby calls sent in'fromthe suhstatiom-Which for any reason are not answered "bytheope'rator at the central oifice; shall not afiect the-record. To makearecord the concerted action of the operator and the subscriber isrequired an lprovision is made that no-unaidcd act, eitheron the part ofthe subscriber .or of the operator at the central office, shallfbecapable ef affecting-- the record. Thus only such callsas the subscribermay be justly-charged'for'can belre': corded, and noopportunit'y isgiven either to the subscriber or to the operator at'the cen:

tral office to falsify the record'by the manipulation of theirapparatus; v

, For the purposes described above I asso: cate a recording mechanism orcounter with the substation-line at a convenient-point within thetelephone central offlce, the mechanism being so'constructed andassociated with the substations circuit within the switchboard that itcan only be caused to make a record by the cycle ofoperations-whichresult when a signaling-current is-Sent in over-the linefrom the snbstationand an operator at the central office switchesintojthe'circuit toanswerthe call. 3y theinvention existing telephonesystems may be brought under the measureghservice' system-that is, theinvention may be 30p" erated in connection with .widely-difierenttelephone systems. For instance, it is applicable to the old systems, inwhich each sub station is provided with a separate local bat-- ftery forthe supply of current to the'trans-- initter, and where' the subscribersends in his calling: or disconnecting signal to, the central oiiice byoperating by hands-local magnetostood.

coil 1'. .Tis the telephone-receiver.

zgcnerator. Itis likewise applicable to the new system, in which thecurrent necessary for theoperation of the substation-transmitters issupplied by a common centralized bat- 5 5 tery located at the centraloffice and in which all the signals are entirely automatic.

The circuits and apparatus by which the invention is carried into.effect are best de scribed by having reference to the accom- 6o panyingdrawings.-

I Figure'l is a'diagrammat-ic sketch of circuit-s,illn'strating theapplication of the inventionto a branch-terminal multiple switch- :boardin the old system in which local trans. 6

mitter-batteries are {employed and in which the'calling anddisconnecting signals are not operated automatically Fig.2 is adiagrammati'c sketch of circuits illustrating the appli cation of the'invention'toa branclrterminal multiple switchboard 'in a. coinmon battery systemwith automatic calling and disconnecting signals. Figs 3, 4, and. 5 aredraw ingsfiillustrating the recording device or counter and so much ofthe electrical; mechanism by which the re'cor'dingff device or counteris operated as {not 'sufli'ciently shown in the diagram sketches atFigs. 2and 3, the said Figs. 3, 4, and g5.being-,-respec-a 'tively; asrelative to'each other, a rear, a side,

and a front elevationi o So far as practicable the same lettering is'followedin the different .figures.. Any departure from the rule willbelreadily under- 8 In Fig. ,1, A is-a tele 'Jhone-substation connpctedwith thecentral office-D by the line wires (1' and a on metalliccircuit. At the substation b is a local battery for the supply ofcurrent-moths variable-resistance trans 9o mitter M. 11' and s" are theprimary and sec ondary helices of the transmitter inductfisonis thegravity or hook switch; Gisthe'hand magneto call-generator,.of which 6'is the automatic cut-out, and .B is a high-impedance call-bell in apermanent bridge across the line. At the central 'oflicegthe substations.line is continued through the switchboard,-

past the various in ultiploseotions, by the wires d and dfi'and isclosed throughthe operht- A in g-winclin g 9f anelectromaguetic'annunciaconnected, by means ofthe "wt-em, through the restori'ng-windin g u ofthe electromagnet 'EQ-andby the wire n to earth G through the second orreleasing magnet 17 of or associated with the-callregisteringrdcviee orcounter F.- his a lamp line-signal. b s the line-signal battery, axisthe first 1nagnetof trolled by the grayity-shutter of the electromagnetE".v -In the lower part of this figure is shown the ope1'ators-.cord,-which bonsists,

-essentiallyyofthree wires f,' f and f terminating, respectively, atbothends in the contact-surfaces 1, 2, and 3 of the cord-plugs P and P,and the wiref beingconirected t0.

:fthe ground G throu 'h the batterybh v It now a call-sigm be sent inover the. line 5 from the substation, the-generator Gis operatedu 'Thccontact'e' is therebyautomatically closed. I A signaling-currentpasses-from-the generator-over the circuit ad'E d a e'. This currentpassing through the operating-windingof the electromagnet'E causes it'sgravityshutter tof all, thereby closing the circuit of the'line-signalbattery I) at thepoint e. This.

causes the lamp-signal L to light and'at-tracts the attention of theoperator to t-hecalh -The closing-of the circuit of the battery?) atthe, point e" also causes a current to flow from the battery through thewinding of thefirst mag-.-

net .2: of' orv associated with the call-registermg device 1 The passageof this'curre'nt its armature, thereby setting in tension '21 smallspiral spring, ;(see s", Fig. 3,) which-is maintained in tension afterthe armature of the magnet 42: is released by a click or detent.

which engages in aratchet wheel. This ratchet-wheel is itself heldstationary by a detent attached to the armature of the secondmagnet y ofF. The details of this mechanism are shown in Fig. aand are explainedhereinafter in connect-ion with that figure;

'1 When the operator sees the line-signal L light, she inserts theanswering-plug I? of her ,cord in the jack of the substations line,which 1 is at her section of thegboard and which is 5 plug-contact',jack-contactgfi, wire m, restoring-winding w of electro'magnet E,. wire0 n, winding; of magnet y, to ground G. The

passage of the resulting current fromltbe bat- I teryb through therestoring-winding'w of the magnet E draws up and restores the shutterIta'cts 4 'of the line-jacks are connected by the the callq'egisteringmechanism 'F, and e is a con-tact normally open and which ais1con--knownIas the ianswening-jack. j A result of this act is to close amficuit extending from the ground G3, through thnlbattery I wiref,

throughthe magnet wIcauses. it to draw up step and register an" answeredcall.

contact e and e.

through the relay E, to the ground G and 'by the click or detent andratchetewheel already mentioned. "lhef passage of the result ing currentfrom the battery b through the -winding of i the second magnet '31causes the armature of this magnet to be drawn up, dis-j engaging thed'etent-catch from "the ratchetwheel, thereby releasing the mechanism ofthe call-register, which; oiving to. the tension in the spring, iscaused to move ahead one I As long as the plug of theopcrator remains-inthe' subs'tation s jack a current from the battery I) flows through therestoring wiuding of the. electromagnetE, keeping its shutter drawnupand the circuit through'the magnet a: 8 I

epen. Inconsequence of this'as long-as the operatorscord-plug-isin thejack the mag-1 net as cannotfbesinfluenced by-any currents sent overthesubscribe'rs line, whether these currents be calling ordisconnecting-signal 6 j currents. Therefore, when I the subscriber hasobtained: thedesired connection and completed' his conversation he sendsin his dis} 4 connecting-sign a1 Icurrentin the usual way by operatingthehand vihagneto-gejnerator G without danger of operating themagnet'mof his call-register.- 'lhe operator at the central officeseeingthedisconnecting-signal with dra\ vs" her cord-plugfrom thesubstationisr linej'afck; This-:re'moves the battery b fronaf tool.

the circuitof the magnet 1 causing it to release its armature;; -whichreturns to its nor- .mal position. The mechanism F is thus re storedtoits normal position, in which it is another call when made nude readyto record answered. a a

I n Fig.-2, A1is a subscribers station connected with the-telephonecentral office D by a metallic circuit composed of the wires a. and a 0.At the substation Bis the call-bell. S is 1 1c the gravityhook-switch.Mis the microphone or-variable-aqasistance transmitter. '1" is thetelephone-receiver, andG is a ground. The circuit is -contirriled'through the switchboard by the wires d and d and through the contacts eand e to the battery I) MIG: line-relay E. 'At each multiple section ofthe switchboarda branch-terminal jack is-permanently bridgeduthese'jacksbeing shown at j, j, and "ff L is the lamp line-signal. b is thelinesignal battery, 4 e is a normallyjopen contact which iscontrolled bythe line-relay E. E is a relay which controls thenornially'closed- 1 Theoutermost contacts" 3 of the line-jacks are connected by the wire m,

through the wires m and n and the coil of the second magnet 'y,'.oforassociated with the call-register F, to'the' ground G. The conu ofthis ele'ctrqiuagnet to its normal position. i wires m and m", throughthe battery I)", to the tery b at the point e, thereby extinguishing USrepresented the o erator.s,cord,-consistin 'thc lam liue-signal L and.releasing the arofithe two wires f an This opens the circuit of theline-signal batg ground G. In.- the lower part of this fig t? Miminating', 'respec-' tively, at each eml in the contact-surfaces] I and 2of the cowl-plugs 1"mir1*1-'.-- The conmet-surfheliws eurl 43 of thecord-plug P are connected togelher and byt-lie wire f through thelamplliseonu(acting-signal K through thecontact (2 iolihe. ground GT.'lhe'feontaetpoints 5 and 6 of the eor'chphr-g 1 are connected. togetherand by the w i re f through the d iseonneetinglz-rm rsig'nnl K andcontact 6 to the ground G. The eoul'eebpoints 5 and G of the plug: 1 arealso eouneeted through a tertiary.-

wirilling of'the operator-sincluetioireoil I,

end through a shmll retardation-coil L tothe ground .6.-

Zfi is the eommon transmittereurreut-suj'iply buttery pernm'uent'lybridged hetween the wires f'hn'd f of the op'eretore eor(l'cireui.tthrough the, two windings of a retarlhilion-eo il lt. QT is the'ope'retors teiephonwreceirer; M is" her trnuu-iieter; if, hertrunsmii-i er-lmttery 32 and s, the primary, and sex-mulory rirulin ofherincluetiou-eoil :i,*:tn l. is a eoudeuer. E 'ehtl fl 'are elee-Moreno-1lelie'reluys which eontro'l'the contacts (f and 6", alreadymentioned. In this system when the subscriber-wishes'e connection heremoves his telephone from thehook-switeh, which 2 utomatieallyeloseshisei reuit thro ugh his, l mu Sill itter and receiver. A-eurrentthen flows from the battery I) through the contact a, theswitehhourd-wire 'd', the line-wire a, trousinitter hl, receiver T,hue-wire}- switelzhoa-i'al wire (Z contacte,j winding of eleetrou hgn etE, and back to the other pole of. the battery Z51. This ourreutenergizesthe "elect roin guet E", which, 'by rttraeting its to the feet timethesiiberi her wishes. a con .heetiou by lhe lighting of "the linesignnllamp L inserts the answering-yflug P in the suhstatic'm line-jock,ihe'eontaet-strip 5 of theplu'g being thereby eeuseglto short-eireuitthe coutuet-point'fi itgrdil .ee the jaek. A current then Iloirs fromthe ground G in Series through the battery 1), wire m5, Wire} 111',Contact lot jack, eoutaei pstrip 5 of plug,

confirm-'53 of jack, wire m, and in parallel toee'rth G'fhnrl G,respectively, through electromu-gnetfll and eleetronuignet 3 Tlheyesultof the *eurrent .fromj the'hettery b passing through the magnet 15 is tocause it/[o drew up its two arnmtures and open the circuit of thebattery I) at the two points a and a. The

current from the buttery 7)- whieh was flowing througlvthe wim'lings oft-he magnet 13' is lines.)

en gage.

therehyinterru ired, ind as it reshltthe armotore or the magnet E isreleased and the circuit of the battery 11 through the lamp line signelI; and through the first magnet 3;,Iis'

The cessation of the" current through the line lmup sigual extin'guishes it and 'theeessation' of the current open at thepoint 2.

through the magnet weauses it to release its armature. [The passage ofthe currentfrom the. better y hthr-oughthe coil of the magnet- 7 causesit to attract its-armature-thereby withdrawing its detent-eoteh from.the f'rat'eh eta-"wheel of the recording mechanism: aemorefully-ehovngin; connection with FigLB'; This permits the ineehenisni under theaction of tlrelspring s Fig'f3, plaeed in tensiorr by th niovemeht-o'tthe armature of the first'meg-J. net-w, tobemovecl {lllQldOljlG-Sllfilland record enh'usw'erecl Cell. When the connection is. nolonger'required, thesuoscriber hangs hi reeeiver'u 'xhi the gravity hook{switch S, thereby opening his circuit. Thiscauses'the eleari ug-outsigiml-lmup K to light, and the operator. seeiug' the signal Withdrawsher coral-plug from "the vsabetaliieus, line-jock. Thie-ziet opens thecircuit oflheb-attery b at the contact-point -;l of the suh'eerihersjut-k,

therebydeeuergiziug the line: rela'y-mag'uet' E and the magnet Theiur-rguet- 3 releases its axe-naturqthe mechanism and looks it. Theumguetlfi re lea-sesfits"ernmtures, which close the suh serihersswitehboaitcl{eh-Quit through the electroma iiiet l5 and battery I)",but since the subserihereliue is o'pen at the suhstz'uiou'the magnet Eremains deenergizecl, f lu- Fig'. 3, hand y are'the two eleetroinag nets\r'liielilmre'beeu referred to ahove as FlSSOClRLOClWltlI thecall-register mechanism and also as, the first and second magnet,respeetiyehy. I y is the armature of the magnet u tl'CiGllt'CPll-cfi ofwhich en-l Igogesin'the ratchet-wheel 'ol' the recording 7, and .r"thearmature of the magnet- 'lh e nrnmtures are shown in their nornml posi fHelm-but, when the magnets are energized the armature 11: ie'drmvn intocontact with ore 'p'ole lf'of the magnet :0 against th'eli etrze'tileforee of ihe spir211 'spri n s and the armature j ieclrawniuiocontact with the pole I'-" of {he nm-gnet yagninst the retraetile forceof the spring 5. 'lhe urmnturem 'ear lies a leg- Z, attached to itsextremity, which leg terminates ill 21 foot (1. The spiral spring" isdeemed atone extremityih theiusugrl manner at JL-while the otherextrenaity attached to the disk v1),

rotate on the shaft 5 it uotbeing rigidly ettaehed't'o the shaft. Itcarries a click a, re-

-stored by the bent spring 3 The foot-(Fol? (Shown in dotted This diskis mounted en-d'is free to l the leg Z, attachedtothe armature .r',engages in a'--l.1.-iaugular;slot out in the periphery of the disk D: Onthe same shaft 5 is rigidly mounted it ratchet-wheel W, so that it'eanonly revolve with the shaft. Into the Teeth of this\VllO-Gltl18'(l(\COllt-Cfll3Qll d and the click The shaft 5' connectswith the reg; is'teriug mechanism, lfhe re?'olu't;iou--offl 3 5 tion,(shown bythe fnlllines), andin doingso shaft.si'ootrespondine to e:eircumferentiai displaeement of the ratehet-whee1 equal 420 su-flieienttogreeord an answereilcalln;

the width'o'fone tooth being necessary-end,

glows The lmagnet a: is energizeq when the suhseribensends in hiseall. 3This d-mws'pp' ,the r erni-aturewfto' the poleP-SI of'the magnet;-

- ma ing t erllee t e-the,i' g t- :Th ot n- Letthe I egZeeu'ses theheelIt QfI vth'e foot (195, at.-

zte hedz te h sl gyt pi s againsti the urfa e ogfi the trjengglarsjlqtiin the disk D; against i no any rests In; sp Se, to this I messnnehed kz e e yes; cen yi'ne' b k h mtchetwheeltWi as. show-1 y he e econtact withthe second snrfaoefot the -t1 -.ia, n 2o g'ular slot in thedisk 1).. ,flfhe motion ot-t-ire disk D pujts in tension 7 thespiraLspring'sfl'to 1 are new: free; to. move adistanee correspondintothe widthof one tooth of the wheel,

v )i'ard movement, of the click is limite'd'to that of one toothoftheratchet-wheel by the moi-.

which it is attached, and this .tension is main I fainedeven after thearmature to is released fast by the detent-cateh d I Inter plugs intoanswer the call, the magnet :1; is deenerg ized, while the magnet yjisener gized. 'lhe-resuIt of this is that thearmature m'is re1e2tsed,whereas y'yis drawn upto the, 1' polemeet-$1 by-the' magnet :17, owingto'the I click Qbeing engaged in the ratc het-WheeLW YWhieh is held Thearmature yearries with it the detc'mt-c enehld? andthereby releases theretohet-wheel W and shaft 3?. The spring e being under tensionrestores'".the disk D and its associated-click c to its normal posirevolv es the I ra'tohet' wheel and shaft, which thus registering an answered08.11. This for 7' t ioli'ofthe' foot d, which in; turn isIlimit-ed I vby the leg I oom'ingf in contact withthe back: 1* 45 It is-to heobseriied that for theoneration of the mechanism- 11. e., in order, tocause. it

ltoireeord'anenswered cane-the concerted aefionbf the subscriber andthefoperavtor ztt the eentralt oiifiee is required; since in no way canthe energizing of either onefof the magnets a:

' -or 1'a1one-c.at1sefthe shaft S? tolrotate; and

Y registeren answered call.

'\ In FigsYt-end 5,}S.is the shaft, already me lttioned-v inconneotion-withFig. 3, which,

- conhectsthe ratehetwheeHV with the indexpointers P, Pfi-Pinndlf, thatindicate the When the pe, 1

dredt-h of theidivision Qn' the dial-D and the tion with a snbscribers line-eenteringthereat,

inlnding the subscribers line-signalv me eh-" anism, of first a.registering mechanism of'two registered eal lsfniioii thefiial's D D51); the "D respeetive1y, e teh dial having ten -diVis ions upon'itsface; The motions of, the shaft 8 ers: o'ommnnicated to the'spindles,upon which the pointers P'-,1 P, and? are rigidly mounted, bymeans ofthe train of gearwheel's w 0 and 101 re spec't-ively,whieh in turn arerigidly mounted npon'the spindles thountedthepinions 1*",1 v and 'urespeg- .tiVGIY WhiC-h engegewit-h the toothed. wheels I tethose on theeorresponding wheels wflfwf I A te w f and'wfl respeetiveiy/ The ratioof the number of teeth. on eaohpinion-v', '0 'andv andwi? isoneto' ten.

In the-operation ofth neelmnis'ni.a 1110-1- i'tiou of theshait S due toa circumferential displacement. of the' ratohetwheei Wtolg f" distancecorresponding tonne of its ten teeth", willmovefthepointer P aheadone-of 'the'ten d ie ens t e ate t e vdi D th y reoqrding anensweredcell, "j'lhis moti'on iof the shaft s eeting'through the train of wheelsdeseribedaboyewill moyeahead the'bointen P eoneetenth of 'oneof'thedivisions on the fajoe'of the dial D}; the pointer P one-hunpointerP one-thousandth" the dial D I I J Ic1ai'm-$-' e I. I-Ifnatelephone-switchboarci,the eombinar' movements; second an'eleetricztlmechanism the operation of which causes or permits-thefirst'movementofsaid registering mechanism to be taken,- while its own operation forsuch purpose is oensed-by the ioperationof :the

s hbscriberzslinegsignel mechanism and third an electrical}niehanisnrthe operation of which causes or permits thes e eond movement of'saidre'giste l-ing mechanism to be taken,

while its own operation. for suehpurpose is caused by the completion ofthe operetors answeringcirou it; the two said eiectrieel mechanismsbeing also so associatemthatnot only the infective operation ofthesecond can- -not take plaoewithontthe previous operation of the firstbut the operation of theseeond prevents fnrtheroperationpf the first,substantially as described.

I VVitne'sses: I v GEQ. -WILLIs PIERCE, JOSEPH A. GATELY.

5 113, off, and 21:, respectively! Uponthesheft S and-the spindles u andni are-rigidly roe I HAMi-ionnv; HAY ESQf

